# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
import random
from FetchFund.settings import USER_AGENT_LIST,PROXIES_LIST
import requests

class RandomUserAgent(object):
    def process_request(self, request, spider):

        ua = random.choice(USER_AGENT_LIST)
        request.headers['User-Agent'] = ua
        #不写return,则直接交给下载器
        #return则返回给调度器

#代理池 判断代理池可用
class ProxyMiddleware(object):

    def __init__(self):
        self.proxy_enable = True
        #代理网站得到ip列表
        self.proxies_list=[]
        # self.proxies_list=get_ip()
        for proxy_url in PROXIES_LIST:
            if self.check_ip(proxy_url) :
                self.proxies_list.append(proxy_url)
        if len(self.proxies_list)==0:
            #raise Exception('no proxy is available')
            self.proxy_enable=False

    def process_request(self, request, spider):
        if self.proxy_enable:
            ip=random.choice(self.proxies_list)
            request.meta['proxy'] = ip

    # proxy ip check
    def check_ip(self, proxy_url):
        #headers = {'User-Agent': self.ua.random}  # 定制请求头
        headers = {'User-Agent': 'Mozilla/5.0 (compatible; WOW64; MSIE 10.0; Windows NT 6.2)'}
        try:
            url = "http://www.ip138.com/"
            url = "https://httpbin.org/ip"

            if proxy_url.startswith("http://"):
                proxies = {
                "http": proxy_url
                }
            else:
                proxies = {
                    "https": proxy_url
                }
            code = requests.get(url=url, proxies=proxies, headers=headers, timeout=10).status_code
            if code == 200:
                return True
            else:
                return False
        except Exception as e:
            print('Error:', e)
            return False



class FetchfundSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)


class FetchfundDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)


def get_ip(self):
    responese=requests.get(url='http://ip.42.pl')
    porxy_ip_list=responese.json().get["data"]["list"]
    ip_list=[]
    for ip in ip_list:
        ip_address=ip["ip"]
        port=ip["port"]
        proxies = "http://{}:{}".format(ip_address,port)
        ip_list.append(proxies)
    return ip_list